13246461
Description
Flashcards by iciar de yraola , updated more than 1 year ago
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Created by iciar de yraola
over 6 years ago
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| Question | Answer |
| Power (including V) | P = IV P is the power in watts, W I is the current in amperes (amps), A V is the potential differences in volts, V |
| Power (including E) | P = E ÷ t P is the power in watts, W E is the energy transferred (or work done) in joules, J T is the time in seconds, s For example, an electric lamp transfers 500 J in 5 s. What is its power? Power = 500 ÷ 5 = 100 W |
| Potential difference | V= E/Q, o E = V×Q E is the energy transferred in joules, J V is the potential differences in volts, V Q is the charge in coulombs, C For example, much energy is transferred when the potential difference is 120 V and the charge is 2 C? Energy transferred = 120 × 2 = 240 J |
| Power (including R) | P = I2 R P is the power lost in the transmission lines in watts I is the current in the transmission lines in amperes R is the resistance of the transmission lines in ohms |
| Definition: current | A flow of electrical charge |
| Definition: Resistance | Opposition to the flow of charge |
| Definition: potential difference | work done per unit charge |
| ac alternating current | current which alternates direction *** electrical current that repeatedly reverses its direction |
| dc direct current | current which does not alternate direction **** electrical current in a circuit that is in one direction only |
| mains electricity | 230v, 50hz, ac |
| live wire | carries alternating potential difference from the supply |
| neutral wire | completes the circuit |
| current (equation) | Q=It The symbol for charge is Q, it is measured in coulombs (C). The symbol for current is I, it is measured in amperes (A). The symbol for time is t, it is measured in seconds (s). |
| Ohm's law | V=IR Potential difference (V) = current (I) x resistance (R) |
| Resistance of components in series | R total = R1 + R2 Rtotal = combined resistance value (in ohms) R1 = value of resistance in first resistor (in ohms) R2 = value of resistance in second resistor (in ohms) |
| switch (open) | |
| switch (closed) | |
| resistor | |
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Image:
Diode (binary/octet-stream)
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diode |
| variable resistor | |
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Image:
Fuse (binary/octet-stream)
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fuse |
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Image:
Led (binary/octet-stream)
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Light emitting diode (LED) |
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Image:
Lamp (binary/octet-stream)
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lamp |
| voltmeter | |
| ammeter | |
| thermistor | |
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Ldr (binary/octet-stream)
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Light dependent resistor (LDR) |
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Image:
Cell (binary/octet-stream)
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cell |
| battery | |
| series circuit | |
| parallel circuit |
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